title: Ultrasound-assisted extraction of phenolic antioxidants from Acacia confusa flowers and buds.
abstract: Acacia confusa Merr. (Leguminosae), a species native to Taiwan, is widely distributed on the hills and lowlands of Taiwan, and has been used in traditional medicines. In this study, the application of ultrasound-assisted extraction was used to extract the phenolic compounds from A. confusa flowers and buds for the first time. Among the extraction methods, it can significantly enhance the contents of phenolic compounds and antioxidant activities in A. confusa flower and bud extracts using ultrasound-assisted extraction (10  min×12 times). Considering both the solvent consumption and the time needed for extraction, ultrasound-assisted extraction was found to be the most practical approach for the rapid and efficient extraction of bioactive phenolic constituents. In addition, gallic acid, myricitrin-3-rhamnoside, quercitrin-3-rhamnoside, europetin-3-rhamnoside, kaempferol-3-rhamnoside, rhamnetin-3-glucoside, and rhamnetin-3-rhamnoside were also quantified in different extracts by RP-HPLC. It is clear that ultrasound-assisted extraction is an efficient method for extracting phenolic compounds from A. confusa flowers and buds.
authors.affiliation: School of Forestry and Resource Conservation, National Taiwan University, Taipei, Taiwan.
authors.forename: Yu Tang
authors.initials: YT
authors.lastname: Tung
authors.forename: Wei Chun
authors.initials: WC
authors.lastname: Chang
authors.forename: Ping Sheng
authors.initials: PS
authors.lastname: Chen
authors.forename: Tzu Cheng
authors.initials: TC
authors.lastname: Chang
authors.forename: Shang Tzen
authors.initials: ST
authors.lastname: Chang
mesh_terms: D000045:Acacia / Q000737:chemistry*; D000975:Antioxidants / Q000032:analysis / Q000302:isolation & purification*; D005591:Chemical Fractionation / Q000379:methods*; D035264:Flowers / Q000737:chemistry*; D010636:Phenols / Q000032:analysis / Q000302:isolation & purification*; D010936:Plant Extracts / Q000032:analysis / Q000302:isolation & purification*; D014465:Ultrasonics / Q000379:methods*
chemical_list: D000975:Antioxidants; D010636:Phenols; D010936:Plant Extracts